Sewing machine



FIG. 1 is a perspective view of a sewing machine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof; and

FIG. 6 is a top plan view thereof.

The bottom plan view is plain and unornamented. 

The ornamental design for a sewing machine, as shown and described. 